package com.xdu.service.impl;

import com.xdu.dto.GoodsSalesDTO;
import com.xdu.entity.Orders;
import com.xdu.mapper.OrderMapper;
import com.xdu.mapper.UserMapper;
import com.xdu.service.ReportService;
import com.xdu.service.WorkspaceService;
import com.xdu.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        //创建一个用于存放范围内每天日期的集合
        List<LocalDate> localDates = new ArrayList<>();
        //添加第一天的日期
        localDates.add(begin);
        //创建一个添加范围内日期的循环
        while (!begin.equals(end)){
            //循环往后增加天数一直到和范围最后一天的日期相等
            begin = begin.plusDays(1);
            localDates.add(begin);
        }

        //创建一个用于存储每天营业额的集合
        List<Double> turnoverList = new ArrayList<>();
        //遍历日期集合取出每天的营业额
        for (LocalDate date : localDates) {
            //计算每天的开始时间和结束时间
            LocalDateTime dayDateBegin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime dayDateEnd = LocalDateTime.of(date, LocalTime.MAX);
            //统计每天的营业额
            Double turnover = orderMapper.sumByMap(dayDateBegin,dayDateEnd, Orders.COMPLETED);
            //判断是否等于null
            if (turnover == null){
                turnover = 0.0;
            }
            turnoverList.add(turnover);
        }
        //将获得的数据封装到VO返回
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(localDates,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     *
     * @param begin 开始时间
     * @param end   结束时间
     * @return 用户数据
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //创建一个用于存放范围内每天日期的集合
        List<LocalDate> localDates = new ArrayList<>();
        //添加第一天的日期
        localDates.add(begin);
        //创建一个添加范围内日期的循环
        while (!begin.equals(end)){
            //循环往后增加天数一直到和范围最后一天的日期相等
            begin = begin.plusDays(1);
            localDates.add(begin);
        }

        // 存放每天的新增用户套餐 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        localDates.forEach(date -> {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map<String, Object> map = new HashMap<>();
            map.put("end", endTime);

            // 总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            // 新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        });

        // 封装结果数据
        return UserReportVO.builder().dateList(StringUtils.join(localDates, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     *
     * @param begin 开始时间
     * @param end   结束时间
     * @return 订单数据
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //创建一个用于存放范围内每天日期的集合
        List<LocalDate> localDates = new ArrayList<>();
        //添加第一天的日期
        localDates.add(begin);
        //创建一个添加范围内日期的循环
        while (!begin.equals(end)){
            //循环往后增加天数一直到和范围最后一天的日期相等
            begin = begin.plusDays(1);
            localDates.add(begin);
        }

        // 存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        // 遍历dateList集合，查询每天的有效订单数和订单总数
        localDates.forEach(date -> {
            // 查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            // 查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        });

        // 计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = totalOrderCount != 0 ? validOrderCount.doubleValue() / totalOrderCount : 0.0;
        // 计算订单完成率
        return OrderReportVO.builder().dateList(StringUtils.join(localDates, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount).validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量排名top10
     *
     * @param begin 开始时间
     * @param end   结束时间
     * @return 销量排名数据
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).toList();
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).toList();
        String numberList = StringUtils.join(numbers, ",");

        // 封装返回结果数据
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response 响应
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX));

        //通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            assert in != null;
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //填充数据--时间
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

            //获得第4行
            XSSFRow row =sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN),
                        LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 根据条件统计订单数量
     *
     * @param beginTime 开始时间
     * @param endTime   结束时间
     * @param status    订单状态
     * @return 订单数量
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map<String, Object> map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }

}